I haven't gone to Aruba but, I think the street vendors are the ones you're looking for. You can even ask discounts from them. I usually do this in our country. Are you planning to buy dozen of it? For sure, you would be able to buy them all at less price.
Hi! What is a trinkets? How do we use these things? It seems to be a very interesting product. Could I buy a dozen of it? Anyway, does Oranjestad have particular shopping areas?